<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            display: flex;
            border: 1px solid black;
            margin: 10px;
        }

        .box1 {
            align-content: flex-start;
        }

        .box2 {
            align-content: flex-end;
        }

        .box3 {
            align-content: center;
        }

        .box4 {
            align-content: space-between;
        }

        .box5 {
            align-content: space-around;
        }

        .box6 {
            align-content: stretch;
        }
        .block {
            background-color: red;
            height: 100px;
            width: 100px;
            margin: 10px;
        }
    </style>
</head>

<body>
    <div>
        <div class="box box1">
            <div class="block">1</div>
            <div class="block">2</div>
            <div class="block">3</div>
            <div class="block">4</div>
            <div class="block">5</div>
            <div class="block">6</div>
            <div class="block">7</div>
            <div class="block">8</div>
            <div class="block">9</div>
            <div class="block">10</div>
            <div class="block">11</div>
        </div>
        <div class="box box2">
            <div class="block">1</div>
            <div class="block">2</div>
            <div class="block">3</div>
            <div class="block">4</div>
            <div class="block">5</div>
            <div class="block">6</div>
            <div class="block">7</div>
            <div class="block">8</div>
            <div class="block">9</div>
            <div class="block">10</div>
            <div class="block">11</div>
        </div>
        <div class="box box3">
            <div class="block">1</div>
            <div class="block">2</div>
            <div class="block">3</div>
            <div class="block">4</div>
            <div class="block">5</div>
            <div class="block">6</div>
            <div class="block">7</div>
            <div class="block">8</div>
            <div class="block">9</div>
            <div class="block">10</div>
            <div class="block">11</div>
        </div>
        <div class="box box4">
            <div class="block">1</div>
            <div class="block">2</div>
            <div class="block">3</div>
            <div class="block">4</div>
            <div class="block">5</div>
            <div class="block">6</div>
            <div class="block">7</div>
            <div class="block">8</div>
            <div class="block">9</div>
            <div class="block">10</div>
            <div class="block">11</div>
        </div>
        <div class="box box5">
            <div class="block">1</div>
            <div class="block">2</div>
            <div class="block">3</div>
            <div class="block">4</div>
            <div class="block">5</div>
            <div class="block">6</div>
            <div class="block">7</div>
            <div class="block">8</div>
            <div class="block">9</div>
            <div class="block">10</div>
            <div class="block">11</div>
        </div>

        <div class="box box6">
            <div class="block">1</div>
            <div class="block">2</div>
            <div class="block">3</div>
            <div class="block">4</div>
            <div class="block">5</div>
            <div class="block">6</div>
            <div class="block">7</div>
            <div class="block">8</div>
            <div class="block">9</div>
            <div class="block">10</div>
            <div class="block">11</div>
        </div>
    </div>
</body>

</html>